Tectonic deformation in the New Madrid Seismic Zone: Inferences from map view and cross-sectional boundary element models

1993 ◽  
Vol 98 (B4) ◽  
pp. 6639-6664 ◽  
Author(s):  
Joan Gomberg
Keyword(s):  
Boundary Element ◽  
Tectonic Deformation ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Cross Sectional ◽  
New Madrid

Tectonic Deformation in the New Madrid Seismic Zone: Inferences from Boundary Element Modeling

1992 ◽  
Vol 63 (3) ◽  
pp. 407-425 ◽  
Author(s):  
J. S. Gomberg
Keyword(s):  
Boundary Element ◽  
Strain Field ◽  
Tectonic Deformation ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Lake County ◽  
Element Modeling ◽  
Dimensional Boundary ◽  
Length Width ◽  
New Madrid

Abstract The lack of instrumental recordings and of obvious fault scarps associated with the 1811–1812 New Madrid earthquakes necessitates examination of more subtle indicators of the geometry and type of faulting responsible for these events. Morphologic and geologic features and the distribution of modern seismicity are used to infer the number, strike, length, width, type of faulting (strike- or dip-slip), and spatial variability of slip for the major faults in the New Madrid Seismic Zone (NMSZ). This is accomplished through two-dimensional boundary-element modeling of the strain field arising from slip on hypothetical faults that is driven by either coseismic or uniform regional strains. Tectonic deformation is reflected in the seismicity and in morphologic and geologic features including (1) the Lake County uplift, (2) Reelfoot Lake, (3) the deformed rocks of the Blytheville arch, and (4) the St. Francis Sunk Lands. Many of these features can be qualitatively explained as resulting from tectonic deformation due to slip on two left-stepping right-lateral strike-slip faults that are coincident with the northeast-trending zones of seismicity and the Blytheville arch. The morphology appears to be, at least in part, a consequence of major earthquakes that rupture these faults. The locations of the 1811–1812 and largest post-1812 earthquakes and the models are consistent with a process in which the 1811–1812 earthquakes relieved accumulated regional shear strain causing the greatest post-1812 shear strains to exist at the ends of the fault zone. Modeling results also suggest that the numerous small earthquakes in the NMSZ are not aftershocks of the 1811–1812 earthquakes but instead represent continuous localized adjustments to a uniform regional strain field. The Bootheel lineament does not appear to be significant in the shaping the morphology, geologic structure, and pattern of seismicity of the NMSZ. The inferred length of the 1811–1812 earthquake ruptures suggest that their sizes may have been overestimated. Model predicted subsidence within the St. Francis Sunk Lands suggests that tectonic deformation may also influence alluvial processes in the NMSZ.

3D GEOLOGIC MAPPING IN AND ADJACENT TO THE NEW MADRID SEISMIC ZONE, CENTRAL UNITED STATES

2020 ◽  
Author(s):  
Renee M. Reichenbacher ◽  
◽  
Valarie Harrison ◽  
Taylor Andrew Weathers ◽  
Roy B. Van Arsdale ◽  
...  
Keyword(s):  
United States ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Geologic Mapping ◽  
Central United States ◽  
New Madrid

POSSIBLE SURFACE WARPING ALONG THE BOOTHEEL FAULT REVEALED FROM LIDAR, NEW MADRID SEISMIC ZONE, CENTRAL US

2020 ◽  
Author(s):  
Samia Noor ◽  
◽  
Randel Tom Cox ◽  
Robert Smalley ◽  
Md Rizwanul Hasan
Keyword(s):  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
New Madrid

Stream response to repeated coseismic folding, Tiptonville dome, New Madrid seismic zone

Geomorphology ◽  
2002 ◽  
Vol 43 (3-4) ◽  
pp. 313-349 ◽  
Author(s):  
M.J Guccione ◽  
K Mueller ◽  
J Champion ◽  
S Shepherd ◽  
S.D Carlson ◽  
...  
Keyword(s):  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Stream Response ◽  
New Madrid

The June 13, 1975 earthquake and its relationship to the New Madrid seismic zone

1977 ◽  
Vol 67 (1) ◽  
pp. 209-218
Author(s):  
R. B. Herrmann ◽  
G. W. Fischer ◽  
J. E. Zollweg
Keyword(s):  
Parameter Estimation ◽  
Seismic Moment ◽  
Strong Motion ◽  
P Wave ◽  
Eastern North America ◽  
New Madrid Seismic Zone ◽  
Seismic Zone ◽  
Long Period ◽  
Consistent Solution ◽  
New Madrid

abstract The June 13, 1975 earthquake in the New Madrid seismic zone produced the first recorded strong-motion accelerograms for an event in the region, as well as the largest recorded accelerations to date for any event in eastern North America. The peak strong-motion values obtained from an analysis of the accelerograms are the following: amax = 43 cm/sec2, vmax = 1 cm/sec and dmax = 0.05 cm for the longitudinal S88°W component; amax = 31 cm/sec2, vmax = 0.6 cm/sec and dmax = 0.01 cm for the DOWN component; amax = 64 cm/sec2, vmax = 1.6 cm/sec2, and dmax = 0.09 cm for the tangential S02°E component. Source parameter estimation using long-period surface waves, Lg spectra, P-wave first motions and the integrated accelerograms leads to a consistent solution. The seismic moment is estimated to be 4E21 dyne-cm and the corner period 0.6 sec. The corner period-seismic moment pair for this event agrees with the regional scaling of these parameters observed by Street et al. (1975).

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